fixes #2206: race condition prevented generated ebooks from saving

[wolnelektury.git] / apps / catalogue / tasks.py

diff --git a/apps/catalogue/tasks.py b/apps/catalogue/tasks.py
index 86e84a5..cf61789 100755 (executable)
--- a/apps/catalogue/tasks.py
+++ b/apps/catalogue/tasks.py
@@ -3,10 +3,12 @@
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
 from datetime import datetime
+from traceback import print_exc
 from celery.task import task
-import catalogue.models
+from django.conf import settings
 
-@task
+
+# TODO: move to model?
 def touch_tag(tag):
     update_dict = {
         'book_count': tag.get_count(),
@@ -18,4 +20,94 @@ def touch_tag(tag):
 
 @task
 def index_book(book_id, book_info=None):
-    return catalogue.models.Book.objects.get(id=book_id).search_index(book_info)
+    from catalogue.models import Book
+    try:
+        return Book.objects.get(id=book_id).search_index(book_info)
+    except Exception, e:
+        print "Exception during index: %s" % e
+        print_exc()
+        raise e
+
+
+def _build_ebook(book_id, ext, transform):
+    """Generic ebook builder."""
+    from django.core.files import File
+    from catalogue.models import Book
+
+    book = Book.objects.get(pk=book_id)
+    out = transform(book.wldocument())
+    field_name = '%s_file' % ext
+    # Update instead of saving the model to avoid race condition.
+    getattr(book, field_name).save('%s.%s' % (book.slug, ext),
+            File(open(out.get_filename())),
+            save=False
+        )
+    Book.objects.filter(pk=book_id).update(**{
+            field_name: getattr(book, field_name)
+        })
+
+
+@task(ignore_result=True)
+def build_txt(book_id):
+    """(Re)builds the TXT file for a book."""
+    _build_ebook(book_id, 'txt', lambda doc: doc.as_text())
+
+
+@task(ignore_result=True, rate_limit=settings.CATALOGUE_PDF_RATE_LIMIT)
+def build_pdf(book_id):
+    """(Re)builds the pdf file for a book."""
+    from catalogue.models import Book
+    from catalogue.utils import remove_zip
+    from waiter.utils import clear_cache
+
+    _build_ebook(book_id, 'pdf',
+        lambda doc: doc.as_pdf(morefloats=settings.LIBRARIAN_PDF_MOREFLOATS))
+    # Remove cached downloadables
+    remove_zip(settings.ALL_PDF_ZIP)
+    book = Book.objects.get(pk=book_id)
+    clear_cache(book.slug)
+
+
+@task(ignore_result=True, rate_limit=settings.CATALOGUE_EPUB_RATE_LIMIT)
+def build_epub(book_id):
+    """(Re)builds the EPUB file for a book."""
+    from catalogue.utils import remove_zip
+
+    _build_ebook(book_id, 'epub', lambda doc: doc.as_epub())
+    # remove zip with all epub files
+    remove_zip(settings.ALL_EPUB_ZIP)
+
+
+@task(ignore_result=True, rate_limit=settings.CATALOGUE_MOBI_RATE_LIMIT)
+def build_mobi(book_id):
+    """(Re)builds the MOBI file for a book."""
+    from catalogue.utils import remove_zip
+
+    _build_ebook(book_id, 'mobi', lambda doc: doc.as_mobi())
+    # remove zip with all mobi files
+    remove_zip(settings.ALL_MOBI_ZIP)
+
+
+@task(ignore_result=True, rate_limit=settings.CATALOGUE_FB2_RATE_LIMIT)
+def build_fb2(book_id, *args, **kwargs):
+    """(Re)builds the FB2 file for a book."""
+    from catalogue.utils import remove_zip
+
+    _build_ebook(book_id, 'fb2', lambda doc: doc.as_fb2())
+    # remove zip with all fb2 files
+    remove_zip(settings.ALL_FB2_ZIP)
+
+
+@task(rate_limit=settings.CATALOGUE_CUSTOMPDF_RATE_LIMIT)
+def build_custom_pdf(book_id, customizations, file_name):
+    """Builds a custom PDF file."""
+    from django.core.files import File
+    from django.core.files.storage import DefaultStorage
+    from catalogue.models import Book
+
+    print "will gen %s" % DefaultStorage().path(file_name)
+    if not DefaultStorage().exists(file_name):
+        pdf = Book.objects.get(pk=book_id).wldocument().as_pdf(
+                customizations=customizations,
+                morefloats=settings.LIBRARIAN_PDF_MOREFLOATS)
+        DefaultStorage().save(file_name, File(open(pdf.get_filename())))